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+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// multi producer-multi consumer blocking queue.
+// enqueue(..) - will block until room found to put the new message.
+// enqueue_nowait(..) - will return immediately with false if no room left in
+// the queue.
+// dequeue_for(..) - will block until the queue is not empty or timeout have
+// passed.
+
+#include <spdlog/details/circular_q.h>
+
+#include <condition_variable>
+#include <mutex>
+
+namespace spdlog {
+namespace details {
+
+template<typename T>
+class mpmc_blocking_queue
+{
+public:
+ using item_type = T;
+ explicit mpmc_blocking_queue(size_t max_items)
+ : q_(max_items)
+ {}
+
+#ifndef __MINGW32__
+ // try to enqueue and block if no room left
+ void enqueue(T &&item)
+ {
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ pop_cv_.wait(lock, [this] { return !this->q_.full(); });
+ q_.push_back(std::move(item));
+ }
+ push_cv_.notify_one();
+ }
+
+ // enqueue immediately. overrun oldest message in the queue if no room left.
+ void enqueue_nowait(T &&item)
+ {
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ q_.push_back(std::move(item));
+ }
+ push_cv_.notify_one();
+ }
+
+ // try to dequeue item. if no item found. wait upto timeout and try again
+ // Return true, if succeeded dequeue item, false otherwise
+ bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration)
+ {
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); }))
+ {
+ return false;
+ }
+ popped_item = std::move(q_.front());
+ q_.pop_front();
+ }
+ pop_cv_.notify_one();
+ return true;
+ }
+
+#else
+ // apparently mingw deadlocks if the mutex is released before cv.notify_one(),
+ // so release the mutex at the very end each function.
+
+ // try to enqueue and block if no room left
+ void enqueue(T &&item)
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ pop_cv_.wait(lock, [this] { return !this->q_.full(); });
+ q_.push_back(std::move(item));
+ push_cv_.notify_one();
+ }
+
+ // enqueue immediately. overrun oldest message in the queue if no room left.
+ void enqueue_nowait(T &&item)
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ q_.push_back(std::move(item));
+ push_cv_.notify_one();
+ }
+
+ // try to dequeue item. if no item found. wait upto timeout and try again
+ // Return true, if succeeded dequeue item, false otherwise
+ bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration)
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); }))
+ {
+ return false;
+ }
+ popped_item = std::move(q_.front());
+ q_.pop_front();
+ pop_cv_.notify_one();
+ return true;
+ }
+
+#endif
+
+ size_t overrun_counter()
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ return q_.overrun_counter();
+ }
+
+ size_t size()
+ {
+ std::unique_lock<std::mutex> lock(queue_mutex_);
+ return q_.size();
+ }
+
+private:
+ std::mutex queue_mutex_;
+ std::condition_variable push_cv_;
+ std::condition_variable pop_cv_;
+ spdlog::details::circular_q<T> q_;
+};
+} // namespace details
+} // namespace spdlog